Java练习2

package rectangle;

public class Rectangle {
private float length;
private float width;

public Rectangle() {

}
public Rectangle(float length, float width) {
this.length = length;
this.width = width;
}
public float getLength() {
return length;
}
public void setLength(float length) {
this.length = length;
}
public float getWidth() {
return width;
}
public void setWidth(float width) {
this.width = width;
}
}

/**
*
*/
package rectangle;

import java.util.Comparator;

/**
* @author kkquiet
*
*在该方法中找到面积最大和周长最大的rectangle对象
*/
public class Getmax {

/**
* @param args
*/
public static void main(String[] args) {
// TODO 找出周长最大和面积最大的Rectangle
Rectangle [] arr = {new Rectangle(1,2), new Rectangle(3,4), new Rectangle(5,6), new Rectangle(1,3), new Rectangle(2,3)};
Rectangle maxPeri = findPeriMax(arr, new PeriCmp());
Rectangle maxArea = findPeriMax(arr, new AreaCmp());
System.out.println("{"+maxPeri.getLength()+", "+maxPeri.getWidth()+"}");
System.out.println("{"+maxArea.getLength()+", "+maxArea.getWidth()+"}");

}
//找出周长最大的Rectangle
public static Rectangle findPeriMax(Rectangle [] arr, Comparator<? super Rectangle> cmp){
int  mi = 0;
for(int i = 0; i < arr.length; i++){
if (cmp.compare(arr[i], arr[mi]) > 0)
mi = i;
}
return arr[mi];
}
//找出面积最大的Rectangle
public static Rectangle findAreaMax(Rectangle [] arr, Comparator<? super Rectangle> cmp){
int  mi = 0;
for(int i = 0; i < arr.length; i++){
if (cmp.compare(arr[i], arr[mi]) > 0)
mi = i;
}
return arr[mi];
}
}

//周长的比较器
class PeriCmp implements Comparator<Rectangle>{
public int compare(Rectangle r1, Rectangle r2){
return 2*(r1.getLength()+r1.getWidth()) > 2*(r2.getLength()+r2.getWidth())?1:0;
}
}
//面积比较器
class AreaCmp implements Comparator<Rectangle>{
public int compare(Rectangle r1, Rectangle r2){
return r1.getLength()*r1.getWidth() > r2.getLength()*r2.getWidth()? 1:0;
}
}